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Let's Build Another World

Sorry for the lame thread title.

Began a new map last night. It's an experiment, sort of, in that I have a particular world-building idea in the back of my head. Anyway, I have not much time this morning so I'll just post them here in the spirit of "release early, release often".

Have you thought about your climate? I'm thinking that unless your planet's very small, the interior of the supercontintent is likely to be pretty dry, especially the eastern parts. Obviously where you put your mountains will have a big impact. The northernmost regions of the supercontinent could be an ice cap, or the planet could be ice-free and then warmer and wetter overall. Of course the cataclysm will change the climate a lot; the newly-created sea could bring rains to formerly dry regions.

Started to place mountains. It's hindered by the fact that I have absolutely no idea where the smaller continents collided. Judging by this map of Gondwana, I should probably have some severely mountainous regions here and there.

A few of the angles are a bit sharp; plate boundaries typically, though not always, meet at 120 degree angles. In any event, those on the supercontinent would mostly be old boundaries.

Your ranges on the eastern and western coasts are indeed appropriate. They'd be analogous to the modern Andes, quite high and possibly have a fair few volcanoes.

Your inland areas are also I think decent. I would suggest making one at most high mountains from an active continental collision (like the Himalayas). The others would likely be older and eroded down more, think like the Appalachians maybe. All would be non-volcanic I think.